The Seal Performance of Compliant Foil Gas Seal Based on Multi-Scale Analysis

Wang, Xueliang; Liu, Meihong

doi:10.3390/pr10061123

Cited by 3 publications

(2 citation statements)

References 13 publications

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“…Chen Shuda [100] used a combination of the finite element method and a Newton-Raphson iterative method for the sealing of high-pressure cylinders of steam turbines, using high-temperature and high-pressure water vapor as the sealing medium, to analyze the effects of arch foil thickness, eccentricity, etc., on the static characteristics of the compliant foil seal. Wang Xueliang et al [101] analyzed the sealing characteristics of compliant foil cylindrical gas film seals with different surface roughness values, and tested the influence of surface roughness values on the start-stop cycling performance of high-speed compliant foil seals, and the results showed that the improvement of interfacial surface properties can effectively a enuate the hysteresis effect of the seal. Sun Junfeng et al [102] proposed a new compliant support foil gas film seal structure that can absorb vibration and reduce thermal deformation of the rotor system, as shown in Figure 21.…”

Section: Compliant Foil Cylindrical Gas Film Seal Structuresmentioning

confidence: 99%

Research Status and Development Trend of Cylindrical Gas Film Seals for Aeroengines

Jiang,

Yu,

Wang

et al. 2023

Processes

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High-performance aeroengine design is an important component of modern industry, and advanced sealing technology is a key technology to meet the engine fuel consumption rate, thrust-to-weight ratio, pollutant emission, durability, and lifetime. Reducing the internal airflow leakage of the engine through a sealing technology can improve the performance and efficiency of the engine. In this paper, the typical sealing technology for an aeroengine is introduced in more detail, including the structural characteristics and use limitations of the labyrinth seal, brush seal, honeycomb seal, gas film face seal, and cylindrical gas film seal. It focuses on the development history, typical structure type, working principle, basic technology research method, steady-state performance, dynamic characteristics, multi-physical field coupling, structural deformation, experimental testing, processing technology. Finally, it summarizes the problems and future development trends of the current application of the cylindrical gas film seal in aeroengines, and points out that the seal performance test and evaluation based on advanced composite sensor technology and the innovative design of the seal based on new material, a new principle, and a new structure will be the new research direction.

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Section: Compliant Foil Cylindrical Gas Film Seal Structuresmentioning

confidence: 99%

Research Status and Development Trend of Cylindrical Gas Film Seals for Aeroengines

Jiang,

Yu,

Wang

et al. 2023

Processes

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“…Based on the fluid-solid coupling analysis method, Sun et al [19] explored the static characteristics of compliant foil gas seal and the mechanical properties of its supporting structures under different operating parameters. Wang et al [20,21] studied the effects of structural and operating parameters on steady-state sealing performance and gas film dynamic characteristics of compliant foil gas seal.…”

Section: Introductionmentioning

confidence: 99%

Study on Sealing Characteristics of Compliant Foil Face Gas Seal under Typical Hypervelocity Gas Effects

Chen

Wang

et al. 2023

Lubricants

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In order to investigate the influence of typical hypervelocity gas effects on the gas lubrication performance of compliant foil face gas seal (CFFGS) end surfaces, the gas–elastic coupling lubrication theory model of CFFGS is modified by considering the choked flow and inertia effect, and the lubrication performance is solved using the finite difference method. Based on the choking effect, the effect of hypervelocity choked flow on the pressure field and velocity field of the seal is analyzed, and the influence of operating parameters on the choked flow and the mechanism of choked flow on the change in dynamic lubrication and sealing performance are explored. Furthermore, based on the inertia effect, the effect of gas inertia force on the flow field, and the correlation law between the pressure field and velocity field under the influence of operating parameters are studied. Then, the relationship between the inertia effect and sealing performance are analyzed. The results show that choked flow increases sealing outlet pressure significantly, from 0.1 MPa to a maximum of 14.25 MPa, and the sealing outlet flow velocity decreases by up to 50 times. The increase in medium pressure and balance film thickness aggravate the choking effect, resulting in a 20% maximum increase in opening force and a 99.6% maximum decrease in leakage rate. In addition, the inertia effect causes obvious centrifugal movement of the gas flow. As result, the radial flow velocity reduces by up to 50%, and the pressure distribution varies widely. Especially under high rotational speed and high medium pressure, the inertia effect is enhanced to clearly reduce the opening force (max. decrement of 3.5%) and leakage rate (max. decrement of 23%).

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Parametric Analysis of Compliant End Face Gas Film Seals Considering Slip Flow Effects

Jiang,

Yu,

Ding

2024

Applied Sciences

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Aiming at the compliant end face gas film seal structure, based on the linearized Boltzmann equation, the Poiseuille flow coefficient is introduced, and the generalized Reynolds equation and the sealing performance parameter solution formula considering the boundary slip flow effect are established. Through Newton–Raphson iterative calculation, the degree of influence of the slip flow effect under different working conditions is analyzed, and the internal relationship between structural parameters and sealing performance is compared. The results show that the slip flow effect can have a large impact on the pressure distribution in the fluid field close to the low-pressure side. Due to the existence of the step phenomenon of boundary velocity, it is not conducive to increasing the gas film opening force and controlling the mass leakage rate, but it can play a positive role in reducing the viscous friction power consumption. In the case of a smaller sealing gas film thickness and lower medium pressure, the slip flow effect is significant, which will have a greater impact on the sealing performance, and at this time, the slip flow effect can not be ignored. In addition, the change in seal structure parameters will also have a large impact on the sealing performance. With an increase in the wave foil thickness, the compliant end face evolves towards the rigid end face, the fluid wedge effect is weakened, and the gas film opening force and mass leakage rate are reduced. The stiffness-to-leakage ratio shows a strong nonlinear decreasing trend with an increase in the wave foil chord length and pitch, which eventually tends to a stable value. The results of this paper provide a theoretical basis for the matching design of the structural parameters of compliant end-face gas film seals under different service conditions.

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The Seal Performance of Compliant Foil Gas Seal Based on Multi-Scale Analysis

Cited by 3 publications

References 13 publications

Research Status and Development Trend of Cylindrical Gas Film Seals for Aeroengines

Research Status and Development Trend of Cylindrical Gas Film Seals for Aeroengines

Study on Sealing Characteristics of Compliant Foil Face Gas Seal under Typical Hypervelocity Gas Effects

Parametric Analysis of Compliant End Face Gas Film Seals Considering Slip Flow Effects

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